mirror of https://github.com/pret/pokecrystal.git
859 lines
12 KiB
NASM
859 lines
12 KiB
NASM
BlankScreen:
|
|
call DisableSpriteUpdates
|
|
xor a
|
|
ldh [hBGMapMode], a
|
|
call ClearBGPalettes
|
|
call ClearSprites
|
|
hlcoord 0, 0
|
|
ld bc, wTilemapEnd - wTilemap
|
|
ld a, " "
|
|
call ByteFill
|
|
hlcoord 0, 0, wAttrmap
|
|
ld bc, wAttrmapEnd - wAttrmap
|
|
ld a, $7
|
|
call ByteFill
|
|
call WaitBGMap2
|
|
call SetPalettes
|
|
ret
|
|
|
|
SpawnPlayer:
|
|
ld a, -1
|
|
ld [wObjectFollow_Leader], a
|
|
ld [wObjectFollow_Follower], a
|
|
ld a, PLAYER
|
|
ld hl, PlayerObjectTemplate
|
|
call CopyPlayerObjectTemplate
|
|
ld b, PLAYER
|
|
call PlayerSpawn_ConvertCoords
|
|
ld a, PLAYER_OBJECT
|
|
call GetMapObject
|
|
ld hl, MAPOBJECT_COLOR
|
|
add hl, bc
|
|
ln e, PAL_NPC_RED, OBJECTTYPE_SCRIPT
|
|
ld a, [wPlayerSpriteSetupFlags]
|
|
bit PLAYERSPRITESETUP_FEMALE_TO_MALE_F, a
|
|
jr nz, .ok
|
|
ld a, [wPlayerGender]
|
|
bit PLAYERGENDER_FEMALE_F, a
|
|
jr z, .ok
|
|
ln e, PAL_NPC_BLUE, OBJECTTYPE_SCRIPT
|
|
|
|
.ok
|
|
ld [hl], e
|
|
ld a, PLAYER_OBJECT
|
|
ldh [hMapObjectIndex], a
|
|
ld bc, wMapObjects
|
|
ld a, PLAYER_OBJECT
|
|
ldh [hObjectStructIndex], a
|
|
ld de, wObjectStructs
|
|
call CopyMapObjectToObjectStruct
|
|
ld a, PLAYER
|
|
ld [wCenteredObject], a
|
|
ret
|
|
|
|
PlayerObjectTemplate:
|
|
; A dummy map object used to initialize the player object.
|
|
; Shorter than the actual amount copied by two bytes.
|
|
; Said bytes seem to be unused.
|
|
_NUM_OBJECT_EVENTS = 0
|
|
object_event -4, -4, SPRITE_CHRIS, SPRITEMOVEDATA_PLAYER, 15, 15, -1, -1, 0, OBJECTTYPE_SCRIPT, 0, 0, -1
|
|
|
|
CopyDECoordsToMapObject::
|
|
push de
|
|
ld a, b
|
|
call GetMapObject
|
|
pop de
|
|
ld hl, MAPOBJECT_X_COORD
|
|
add hl, bc
|
|
ld [hl], d
|
|
ld hl, MAPOBJECT_Y_COORD
|
|
add hl, bc
|
|
ld [hl], e
|
|
ret
|
|
|
|
PlayerSpawn_ConvertCoords:
|
|
push bc
|
|
ld a, [wXCoord]
|
|
add 4
|
|
ld d, a
|
|
ld a, [wYCoord]
|
|
add 4
|
|
ld e, a
|
|
pop bc
|
|
call CopyDECoordsToMapObject
|
|
ret
|
|
|
|
WriteObjectXY::
|
|
ld a, b
|
|
call CheckObjectVisibility
|
|
ret c
|
|
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, bc
|
|
ld e, [hl]
|
|
ldh a, [hMapObjectIndex]
|
|
ld b, a
|
|
call CopyDECoordsToMapObject
|
|
and a
|
|
ret
|
|
|
|
RefreshPlayerCoords:
|
|
ld a, [wXCoord]
|
|
add 4
|
|
ld d, a
|
|
ld hl, wPlayerStandingMapX
|
|
sub [hl]
|
|
ld [hl], d
|
|
ld hl, wMapObjects + MAPOBJECT_X_COORD
|
|
ld [hl], d
|
|
ld hl, wPlayerLastMapX
|
|
ld [hl], d
|
|
ld d, a
|
|
ld a, [wYCoord]
|
|
add 4
|
|
ld e, a
|
|
ld hl, wPlayerStandingMapY
|
|
sub [hl]
|
|
ld [hl], e
|
|
ld hl, wMapObjects + MAPOBJECT_Y_COORD
|
|
ld [hl], e
|
|
ld hl, wPlayerLastMapY
|
|
ld [hl], e
|
|
ld e, a
|
|
; the next three lines are useless
|
|
ld a, [wObjectFollow_Leader]
|
|
cp PLAYER
|
|
ret nz
|
|
ret
|
|
|
|
CopyObjectStruct::
|
|
call CheckObjectMask
|
|
and a
|
|
ret nz ; masked
|
|
|
|
ld hl, wObjectStructs + OBJECT_LENGTH * 1
|
|
ld a, 1
|
|
ld de, OBJECT_LENGTH
|
|
.loop
|
|
ldh [hObjectStructIndex], a
|
|
ld a, [hl]
|
|
and a
|
|
jr z, .done
|
|
add hl, de
|
|
ldh a, [hObjectStructIndex]
|
|
inc a
|
|
cp NUM_OBJECT_STRUCTS
|
|
jr nz, .loop
|
|
scf
|
|
ret ; overflow
|
|
|
|
.done
|
|
ld d, h
|
|
ld e, l
|
|
call CopyMapObjectToObjectStruct
|
|
ld hl, wVramState
|
|
bit 7, [hl]
|
|
ret z
|
|
|
|
ld hl, OBJECT_FLAGS2
|
|
add hl, de
|
|
set 5, [hl]
|
|
ret
|
|
|
|
CopyMapObjectToObjectStruct:
|
|
call .CopyMapObjectToTempObject
|
|
call CopyTempObjectToObjectStruct
|
|
ret
|
|
|
|
.CopyMapObjectToTempObject:
|
|
ldh a, [hObjectStructIndex]
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld [hl], a
|
|
|
|
ldh a, [hMapObjectIndex]
|
|
ld [wTempObjectCopyMapObjectIndex], a
|
|
|
|
ld hl, MAPOBJECT_SPRITE
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld [wTempObjectCopySprite], a
|
|
|
|
call GetSpriteVTile
|
|
ld [wTempObjectCopySpriteVTile], a
|
|
|
|
ld a, [hl]
|
|
call GetSpritePalette
|
|
ld [wTempObjectCopyPalette], a
|
|
|
|
ld hl, MAPOBJECT_COLOR
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and $f0
|
|
jr z, .skip_color_override
|
|
swap a
|
|
and PALETTE_MASK
|
|
ld [wTempObjectCopyPalette], a
|
|
|
|
.skip_color_override
|
|
ld hl, MAPOBJECT_MOVEMENT
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld [wTempObjectCopyMovement], a
|
|
|
|
ld hl, MAPOBJECT_RANGE
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld [wTempObjectCopyRange], a
|
|
|
|
ld hl, MAPOBJECT_X_COORD
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld [wTempObjectCopyX], a
|
|
|
|
ld hl, MAPOBJECT_Y_COORD
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld [wTempObjectCopyY], a
|
|
|
|
ld hl, MAPOBJECT_RADIUS
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld [wTempObjectCopyRadius], a
|
|
ret
|
|
|
|
InitializeVisibleSprites:
|
|
ld bc, wMap1Object
|
|
ld a, 1
|
|
.loop
|
|
ldh [hMapObjectIndex], a
|
|
ld hl, MAPOBJECT_SPRITE
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a
|
|
jr z, .next
|
|
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp -1
|
|
jr nz, .next
|
|
|
|
ld a, [wXCoord]
|
|
ld d, a
|
|
ld a, [wYCoord]
|
|
ld e, a
|
|
|
|
ld hl, MAPOBJECT_X_COORD
|
|
add hl, bc
|
|
ld a, [hl]
|
|
add 1
|
|
sub d
|
|
jr c, .next
|
|
|
|
cp MAPOBJECT_SCREEN_WIDTH
|
|
jr nc, .next
|
|
|
|
ld hl, MAPOBJECT_Y_COORD
|
|
add hl, bc
|
|
ld a, [hl]
|
|
add 1
|
|
sub e
|
|
jr c, .next
|
|
|
|
cp MAPOBJECT_SCREEN_HEIGHT
|
|
jr nc, .next
|
|
|
|
push bc
|
|
call CopyObjectStruct
|
|
pop bc
|
|
jp c, .ret
|
|
|
|
.next
|
|
ld hl, MAPOBJECT_LENGTH
|
|
add hl, bc
|
|
ld b, h
|
|
ld c, l
|
|
ldh a, [hMapObjectIndex]
|
|
inc a
|
|
cp NUM_OBJECTS
|
|
jr nz, .loop
|
|
ret
|
|
|
|
.ret
|
|
ret
|
|
|
|
CheckObjectEnteringVisibleRange::
|
|
nop
|
|
ld a, [wPlayerStepDirection]
|
|
cp STANDING
|
|
ret z
|
|
ld hl, .dw
|
|
rst JumpTable
|
|
ret
|
|
|
|
.dw
|
|
dw .Down
|
|
dw .Up
|
|
dw .Left
|
|
dw .Right
|
|
|
|
.Up:
|
|
ld a, [wYCoord]
|
|
sub 1
|
|
jr .Vertical
|
|
|
|
.Down:
|
|
ld a, [wYCoord]
|
|
add 9
|
|
.Vertical:
|
|
ld d, a
|
|
ld a, [wXCoord]
|
|
ld e, a
|
|
ld bc, wMap1Object
|
|
ld a, 1
|
|
.loop_v
|
|
ldh [hMapObjectIndex], a
|
|
ld hl, MAPOBJECT_SPRITE
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a
|
|
jr z, .next_v
|
|
ld hl, MAPOBJECT_Y_COORD
|
|
add hl, bc
|
|
ld a, d
|
|
cp [hl]
|
|
jr nz, .next_v
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp -1
|
|
jr nz, .next_v
|
|
ld hl, MAPOBJECT_X_COORD
|
|
add hl, bc
|
|
ld a, [hl]
|
|
add 1
|
|
sub e
|
|
jr c, .next_v
|
|
cp MAPOBJECT_SCREEN_WIDTH
|
|
jr nc, .next_v
|
|
push de
|
|
push bc
|
|
call CopyObjectStruct
|
|
pop bc
|
|
pop de
|
|
|
|
.next_v
|
|
ld hl, MAPOBJECT_LENGTH
|
|
add hl, bc
|
|
ld b, h
|
|
ld c, l
|
|
ldh a, [hMapObjectIndex]
|
|
inc a
|
|
cp NUM_OBJECTS
|
|
jr nz, .loop_v
|
|
ret
|
|
|
|
.Left:
|
|
ld a, [wXCoord]
|
|
sub 1
|
|
jr .Horizontal
|
|
|
|
.Right:
|
|
ld a, [wXCoord]
|
|
add 10
|
|
.Horizontal:
|
|
ld e, a
|
|
ld a, [wYCoord]
|
|
ld d, a
|
|
ld bc, wMap1Object
|
|
ld a, 1
|
|
.loop_h
|
|
ldh [hMapObjectIndex], a
|
|
ld hl, MAPOBJECT_SPRITE
|
|
add hl, bc
|
|
ld a, [hl]
|
|
and a
|
|
jr z, .next_h
|
|
ld hl, MAPOBJECT_X_COORD
|
|
add hl, bc
|
|
ld a, e
|
|
cp [hl]
|
|
jr nz, .next_h
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp -1
|
|
jr nz, .next_h
|
|
ld hl, MAPOBJECT_Y_COORD
|
|
add hl, bc
|
|
ld a, [hl]
|
|
add 1
|
|
sub d
|
|
jr c, .next_h
|
|
cp MAPOBJECT_SCREEN_HEIGHT
|
|
jr nc, .next_h
|
|
push de
|
|
push bc
|
|
call CopyObjectStruct
|
|
pop bc
|
|
pop de
|
|
|
|
.next_h
|
|
ld hl, MAPOBJECT_LENGTH
|
|
add hl, bc
|
|
ld b, h
|
|
ld c, l
|
|
ldh a, [hMapObjectIndex]
|
|
inc a
|
|
cp NUM_OBJECTS
|
|
jr nz, .loop_h
|
|
ret
|
|
|
|
CopyTempObjectToObjectStruct:
|
|
ld a, [wTempObjectCopyMapObjectIndex]
|
|
ld hl, OBJECT_MAP_OBJECT_INDEX
|
|
add hl, de
|
|
ld [hl], a
|
|
|
|
ld a, [wTempObjectCopyMovement]
|
|
call CopySpriteMovementData
|
|
|
|
ld a, [wTempObjectCopyPalette]
|
|
ld hl, OBJECT_PALETTE
|
|
add hl, de
|
|
or [hl]
|
|
ld [hl], a
|
|
|
|
ld a, [wTempObjectCopyY]
|
|
call .InitYCoord
|
|
|
|
ld a, [wTempObjectCopyX]
|
|
call .InitXCoord
|
|
|
|
ld a, [wTempObjectCopySprite]
|
|
ld hl, OBJECT_SPRITE
|
|
add hl, de
|
|
ld [hl], a
|
|
|
|
ld a, [wTempObjectCopySpriteVTile]
|
|
ld hl, OBJECT_SPRITE_TILE
|
|
add hl, de
|
|
ld [hl], a
|
|
|
|
ld hl, OBJECT_STEP_TYPE
|
|
add hl, de
|
|
ld [hl], STEP_TYPE_RESET
|
|
|
|
ld hl, OBJECT_FACING_STEP
|
|
add hl, de
|
|
ld [hl], STANDING
|
|
|
|
ld a, [wTempObjectCopyRadius]
|
|
call .InitRadius
|
|
|
|
ld a, [wTempObjectCopyRange]
|
|
ld hl, OBJECT_RANGE
|
|
add hl, de
|
|
ld [hl], a
|
|
|
|
and a
|
|
ret
|
|
|
|
.InitYCoord:
|
|
ld hl, OBJECT_INIT_Y
|
|
add hl, de
|
|
ld [hl], a
|
|
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, de
|
|
ld [hl], a
|
|
|
|
ld hl, wYCoord
|
|
sub [hl]
|
|
and $f
|
|
swap a
|
|
ld hl, wPlayerBGMapOffsetY
|
|
sub [hl]
|
|
ld hl, OBJECT_SPRITE_Y
|
|
add hl, de
|
|
ld [hl], a
|
|
ret
|
|
|
|
.InitXCoord:
|
|
ld hl, OBJECT_INIT_X
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, wXCoord
|
|
sub [hl]
|
|
and $f
|
|
swap a
|
|
ld hl, wPlayerBGMapOffsetX
|
|
sub [hl]
|
|
ld hl, OBJECT_SPRITE_X
|
|
add hl, de
|
|
ld [hl], a
|
|
ret
|
|
|
|
.InitRadius:
|
|
ld h, a
|
|
inc a
|
|
and $f
|
|
ld l, a
|
|
ld a, h
|
|
add $10
|
|
and $f0
|
|
or l
|
|
ld hl, OBJECT_RADIUS
|
|
add hl, de
|
|
ld [hl], a
|
|
ret
|
|
|
|
TrainerWalkToPlayer:
|
|
ldh a, [hLastTalked]
|
|
call InitMovementBuffer
|
|
ld a, movement_step_sleep
|
|
call AppendToMovementBuffer
|
|
ld a, [wWalkingIntoNPC]
|
|
dec a
|
|
jr z, .TerminateStep
|
|
ldh a, [hLastTalked]
|
|
ld b, a
|
|
ld c, PLAYER
|
|
ld d, 1
|
|
call .GetPathToPlayer
|
|
call DecrementMovementBufferCount
|
|
|
|
.TerminateStep:
|
|
ld a, movement_step_end
|
|
call AppendToMovementBuffer
|
|
ret
|
|
|
|
.GetPathToPlayer:
|
|
push de
|
|
push bc
|
|
; get player object struct, load to de
|
|
ld a, c
|
|
call GetMapObject
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld a, [hl]
|
|
call GetObjectStruct
|
|
ld d, b
|
|
ld e, c
|
|
|
|
; get last talked object struct, load to bc
|
|
pop bc
|
|
ld a, b
|
|
call GetMapObject
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld a, [hl]
|
|
call GetObjectStruct
|
|
|
|
; get last talked coords, load to bc
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, bc
|
|
ld c, [hl]
|
|
ld b, a
|
|
|
|
; get player coords, load to de
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, de
|
|
ld a, [hl]
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, de
|
|
ld e, [hl]
|
|
ld d, a
|
|
|
|
pop af
|
|
call ComputePathToWalkToPlayer
|
|
ret
|
|
|
|
SurfStartStep:
|
|
call InitMovementBuffer
|
|
call .GetMovementData
|
|
call AppendToMovementBuffer
|
|
ld a, movement_step_end
|
|
call AppendToMovementBuffer
|
|
ret
|
|
|
|
.GetMovementData:
|
|
ld a, [wPlayerDirection]
|
|
srl a
|
|
srl a
|
|
maskbits NUM_DIRECTIONS
|
|
ld e, a
|
|
ld d, 0
|
|
ld hl, .movement_data
|
|
add hl, de
|
|
ld a, [hl]
|
|
ret
|
|
|
|
.movement_data
|
|
slow_step DOWN
|
|
slow_step UP
|
|
slow_step LEFT
|
|
slow_step RIGHT
|
|
|
|
FollowNotExact::
|
|
push bc
|
|
ld a, c
|
|
call CheckObjectVisibility
|
|
ld d, b
|
|
ld e, c
|
|
pop bc
|
|
ret c
|
|
|
|
ld a, b
|
|
call CheckObjectVisibility
|
|
ret c
|
|
|
|
; object 2 is now in bc, object 1 is now in de
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, bc
|
|
ld c, [hl]
|
|
ld b, a
|
|
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, de
|
|
ld a, [hl]
|
|
cp b
|
|
jr z, .same_x
|
|
jr c, .to_the_left
|
|
inc b
|
|
jr .continue
|
|
|
|
.to_the_left
|
|
dec b
|
|
jr .continue
|
|
|
|
.same_x
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, de
|
|
ld a, [hl]
|
|
cp c
|
|
jr z, .continue
|
|
jr c, .below
|
|
inc c
|
|
jr .continue
|
|
|
|
.below
|
|
dec c
|
|
|
|
.continue
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, de
|
|
ld [hl], b
|
|
ld a, b
|
|
ld hl, wXCoord
|
|
sub [hl]
|
|
and $f
|
|
swap a
|
|
ld hl, wPlayerBGMapOffsetX
|
|
sub [hl]
|
|
ld hl, OBJECT_SPRITE_X
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, de
|
|
ld [hl], c
|
|
ld a, c
|
|
ld hl, wYCoord
|
|
sub [hl]
|
|
and $f
|
|
swap a
|
|
ld hl, wPlayerBGMapOffsetY
|
|
sub [hl]
|
|
ld hl, OBJECT_SPRITE_Y
|
|
add hl, de
|
|
ld [hl], a
|
|
ldh a, [hObjectStructIndex]
|
|
ld hl, OBJECT_RANGE
|
|
add hl, de
|
|
ld [hl], a
|
|
ld hl, OBJECT_MOVEMENTTYPE
|
|
add hl, de
|
|
ld [hl], SPRITEMOVEDATA_FOLLOWNOTEXACT
|
|
ld hl, OBJECT_STEP_TYPE
|
|
add hl, de
|
|
ld [hl], STEP_TYPE_RESET
|
|
ret
|
|
|
|
GetRelativeFacing::
|
|
; Determines which way map object e would have to turn to face map object d. Returns carry if it's impossible for whatever reason.
|
|
ld a, d
|
|
call GetMapObject
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp NUM_OBJECT_STRUCTS
|
|
jr nc, .carry
|
|
ld d, a
|
|
ld a, e
|
|
call GetMapObject
|
|
ld hl, MAPOBJECT_OBJECT_STRUCT_ID
|
|
add hl, bc
|
|
ld a, [hl]
|
|
cp NUM_OBJECT_STRUCTS
|
|
jr nc, .carry
|
|
ld e, a
|
|
call .GetFacing_e_relativeto_d
|
|
ret
|
|
|
|
.carry
|
|
scf
|
|
ret
|
|
|
|
.GetFacing_e_relativeto_d:
|
|
; Determines which way object e would have to turn to face object d. Returns carry if it's impossible.
|
|
; load the coordinates of object d into bc
|
|
ld a, d
|
|
call GetObjectStruct
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, bc
|
|
ld a, [hl]
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, bc
|
|
ld c, [hl]
|
|
ld b, a
|
|
push bc
|
|
; load the coordinates of object e into de
|
|
ld a, e
|
|
call GetObjectStruct
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, bc
|
|
ld e, [hl]
|
|
pop bc
|
|
; |x1 - x2|
|
|
ld a, b
|
|
sub d
|
|
jr z, .same_x_1
|
|
jr nc, .b_right_of_d_1
|
|
cpl
|
|
inc a
|
|
|
|
.b_right_of_d_1
|
|
; |y1 - y2|
|
|
ld h, a
|
|
ld a, c
|
|
sub e
|
|
jr z, .same_y_1
|
|
jr nc, .c_below_e_1
|
|
cpl
|
|
inc a
|
|
|
|
.c_below_e_1
|
|
; |y1 - y2| - |x1 - x2|
|
|
sub h
|
|
jr c, .same_y_1
|
|
|
|
.same_x_1
|
|
; compare the y coordinates
|
|
ld a, c
|
|
cp e
|
|
jr z, .same_x_and_y
|
|
jr c, .c_directly_below_e
|
|
; c directly above e
|
|
ld d, DOWN
|
|
and a
|
|
ret
|
|
|
|
.c_directly_below_e
|
|
ld d, UP
|
|
and a
|
|
ret
|
|
|
|
.same_y_1
|
|
ld a, b
|
|
cp d
|
|
jr z, .same_x_and_y
|
|
jr c, .b_directly_right_of_d
|
|
; b directly left of d
|
|
ld d, RIGHT
|
|
and a
|
|
ret
|
|
|
|
.b_directly_right_of_d
|
|
ld d, LEFT
|
|
and a
|
|
ret
|
|
|
|
.same_x_and_y
|
|
scf
|
|
ret
|
|
|
|
QueueFollowerFirstStep:
|
|
call .QueueFirstStep
|
|
jr c, .same
|
|
ld [wFollowMovementQueue], a
|
|
xor a
|
|
ld [wFollowerMovementQueueLength], a
|
|
ret
|
|
|
|
.same
|
|
ld a, -1
|
|
ld [wFollowerMovementQueueLength], a
|
|
ret
|
|
|
|
.QueueFirstStep:
|
|
ld a, [wObjectFollow_Leader]
|
|
call GetObjectStruct
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, bc
|
|
ld d, [hl]
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, bc
|
|
ld e, [hl]
|
|
ld a, [wObjectFollow_Follower]
|
|
call GetObjectStruct
|
|
ld hl, OBJECT_NEXT_MAP_X
|
|
add hl, bc
|
|
ld a, d
|
|
cp [hl]
|
|
jr z, .check_y
|
|
jr c, .left
|
|
and a
|
|
ld a, movement_step + RIGHT
|
|
ret
|
|
|
|
.left
|
|
and a
|
|
ld a, movement_step + LEFT
|
|
ret
|
|
|
|
.check_y
|
|
ld hl, OBJECT_NEXT_MAP_Y
|
|
add hl, bc
|
|
ld a, e
|
|
cp [hl]
|
|
jr z, .same_xy
|
|
jr c, .up
|
|
and a
|
|
ld a, movement_step + DOWN
|
|
ret
|
|
|
|
.up
|
|
and a
|
|
ld a, movement_step + UP
|
|
ret
|
|
|
|
.same_xy
|
|
scf
|
|
ret
|